Wireless UE Positioning Using Reduced-Anchor ToA Updates
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Solution Overview
Problem
There is a need for accurate and efficient methods to measure the position of user equipment (UE) in wireless communication systems, particularly in V2X scenarios involving vehicle-to-everything communication, where existing techniques may be inadequate for precise location determination.
Innovation Solution
The method involves measuring a first position of the UE through first Time of Arrival (ToA) positioning using a plurality of anchors, estimating a second position based on the UE's position change, and then measuring a third position using two or more selected anchors, which are chosen based on specific angle criteria to minimize errors and optimize the positioning process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Time of Arrival (ToA) positioning is performed using a plurality of anchors, then positioning accuracy is improved, but measurement time and system complexity increase
Solution Approach 1:
The patent segments the positioning process into two distinct phases: a first ToA positioning measurement using multiple anchors to establish accurate position references, and subsequent position measurements using fewer selected anchors. This segmentation allows the system to achieve accurate positioning over time without requiring all anchors to be simultaneously active, thereby reducing measurement time while maintaining positioning accuracy through the staged approach.
Solution Approach 2:
The patent applies partial action by using only a subset of available anchors for subsequent positioning measurements after the initial full ToA measurement. Instead of continuously using all anchors, the system selectively employs fewer anchors (two or more) for ongoing position measurements, reducing the time and resources required while maintaining acceptable positioning accuracy through intelligent anchor selection based on position change amounts.
2Measurement precision
If ToA positioning is performed using multiple anchors, then positioning accuracy is improved, but device complexity and processing requirements increase
Solution Approach 1:
The patent segments the anchor usage into an initial phase using multiple anchors for accurate ToA positioning, followed by a subsequent phase using fewer selected anchors. This segmentation reduces the computational burden and system complexity for continuous positioning operations while maintaining accuracy through the initial comprehensive measurement and selective anchor usage thereafter.
Solution Approach 2:
The patent extracts and utilizes the position change amount information from the initial ToA positioning measurement to determine subsequent UE positions without requiring all original anchors. By extracting the essential positioning information and using it to select fewer anchors for subsequent measurements, the system reduces processing requirements and device complexity while maintaining positioning functionality.
3Measurement precision
If anchors are selected based on angle criteria to minimize errors, then positioning precision is improved, but calculation complexity increases
Solution Approach 1:
The patent performs preliminary calculations of angles between anchors and the UE's second position before final anchor selection. By pre-calculating these angles and identifying anchors that satisfy the angle criteria (where the angle is greater than a reference angle), the system establishes an optimized anchor set in advance, which simplifies subsequent positioning operations and reduces real-time calculation complexity while improving positioning precision.
Solution Approach 2:
The patent changes the selection criterion from simply using the nearest or arbitrary anchors to selecting anchors based on angular relationships. By introducing the angle parameter (comparing the angle between anchor-UE-anchor against a reference angle), the system optimizes geometric dilution of precision (GDOP) and improves positioning precision. The calculation complexity is managed by performing this angular evaluation once during anchor selection rather than continuously during positioning.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for accurate and efficient measurement of UE positions, enhancing the precision and reliability of V2X communication systems by optimizing the selection of anchors based on angle and channel environment considerations.
Implementation Method 1
measuring a first position of a user equipment (UE) through first Time of Arrival (ToA) positioning using a plurality of anchors
Data Source
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AI summary
Disclosed are a method by which a terminal measures a position in a wireless communication system and an apparatus therefor according to various embodiments. Disclosed are: a method comprising the steps of measuring a first position of the terminal by means of first time of arrival (ToA) positioning that uses a plurality of anchors, estimating a second position of the terminal on the basis of the amount of change in the position of the terminal since the measurement of the first position, and measuring a third position of the terminal by conducting second ToA positioning using two or more anchors, the number of which being reduced from the number of the plurality of anchors; and an apparatus therefor.